/**
 * Description:
 * Author:han
 * Date: 2024-05-21
 */
public class Na {
    int i=0;
    public Na() {
        i++;
    }

    public void show() {
        System.out.println(i);
    }

    public static void main(String[] args) {
        Na na = new Na();
        Na na2 = new Na();
        Na na3 = new Na();
        na.show();
        na2.show();
        na3.show();
        
    }
}
